Sotheby's

a leading firm of auctioneers(= a company that sells things at public events to the people who offer the most money for them). Sotheby's was established in 1744 in London, but its headquarters are now in New York, with offices in many other countries. Sotheby's is famous for dealing in works of art and antiques, and it holds 250 sales each year.compareChristie's